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T3, Total
Test CodeT3TL
Alias/See Also
Triiodothyronine, Total
CPT Codes
84480
Preferred Specimen
Plasma Green (PST)
Other Acceptable Specimens
Serum (RED) or GOLD (SST
Specimen Stability
Within two hours after centrifugation, transfer at least 500 mL of cell-free sample to a storage tube.
Tightly stopper the tube immediately.
Store samples tightly stoppered at room temperature (15 to 30°C) for no longer than eight hours.
If the assay will not be completed within eight hours, refrigerate the samples at 2 to 8°C.
If the assay will not be completed within 48 hours, or for shipment of samples, freeze at -20°C or colder. Thaw samples only once
Tightly stopper the tube immediately.
Store samples tightly stoppered at room temperature (15 to 30°C) for no longer than eight hours.
If the assay will not be completed within eight hours, refrigerate the samples at 2 to 8°C.
If the assay will not be completed within 48 hours, or for shipment of samples, freeze at -20°C or colder. Thaw samples only once
Setup Schedule
24x7
Reference Range
0.87-1.78 ng/mL
Clinical Significance
The clinical importance of total serum T3 determination is in the diagnosis of thyroid disorders. Elevated concentrations of T3 can be found in Grave’s disease, and most other classical causes of hyperthyroidism. Decreased concentrations occur in primary hypothyroid diseases such as Hashimoto’s thyroiditis and neonatal hypothyroidism or secondary hypothyroidism due to defects at the hypothalamo-hypophyseal level.
Performing Laboratory
CRMC Laboratory
